Question

In young double slit experiment, light of wavelength 600 nm falls on the double slits which was separated by 0.1 mm. Say n is the highest order of maximum intensity in the interference pattern obtained on a screen kept 3 m from the slits. If distance of screen from the slits is changed then value of n will –

• A. Increase
• B. Decrease
• C. May remain same
• D. Must remain same

Answer 1

Answer: (D)

Must remain same

Answer 2

nl = d (for maxima)

n_max = $\frac{d}{\lambda}$

n_max does not depend on D